Use the amsmath package to create the below Extensible Arrows symbols
\usepackage{amsmath}
\xleftarrow{abc}
\xrightarrow{abc}
Use the mathtools package to create the below Extensible Arrows symbols
\usepackage{mathtools}
\xhookleftarrow{abc}
\xhookrightarrow{abc}
\xLeftarrow{abc}
\xleftharpoondown{abc}
\xleftharpoonup{abc}
\xleftrightarrow{abc}
\xLeftrightarrow{abc}
\xleftrightharpoons{abc}
\xmapsto{abc}
\xRightarrow{abc}
\xrightharpoondown{abc}
\xrightharpoonup{abc}
\xrightleftharpoons{abc}
Use the chemarrow package to create the below Extensible Arrows symbols
\usepackage{chemarrow}
\autoleftarrow{abc}{def}
\autorightarrow{abc}{def}
\autoleftrightharpoons{abc}{def}
\autorightleftharpoons{abc}{def}
Use the extpfeil package to create the below Extensible Arrows symbols
\usepackage{extpfeil}
\xlongequal{abc}
\xmapsto{abc}
\xtofrom{abc}
\xtwoheadleftarrow{abc}
\xtwoheadrightarrow{abc}
Use the DotArrow package to create the below Extensible Arrows symbols
\usepackage{DotArrow}
\dotarrow{abc}

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